If you see PIN Required on shows "PIN code locked, Unlock is required" on web interface of your mobile Wi-Fi device, it means your SIM card has enabled PIN lock, and you have to enter the PIN code of your SIM card to unlock it.
Tip: The PIN code required is for your SIM card, if you are not sure about the PIN code, please contact the carrier of your SIM card to confirm it, don’t keep trying to enter it if it is incorrect, or your SIM card will be locked.
Method 1: Unlock PIN via web interface
Connect a client device to Wi-Fi network of your Mobile Wi-Fi device, visit tendawifi.com or 192.168.0.1, and log in with the administrative password you set for the Mobile Wi-Fi.
The prompt "PIN code locked.Unlock is required" will appear at the top of the web management page.
Please click on the SIM PIN icon.
You will be required to enter PIN code of your SIM card to unlock it.
Get to know more details of each function and configuration please go to Download Center to download the User guide of your product.